Phase distribution for electric furnaces.



T. F. BAILY & F. T. COPE PHASE DlSTRlBUTION FOR ELECTRIC FURNACES.

APPLICAUON FILED JAN. 31, i918. 1,260,298. Patented Mar. 20. 1915.

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THADDE US F. BAILY AND FRANK T. COPE, OF ALLIANCE, OHIO, ASSIGNOBS TO THE ELECTRIC FURNACE COMPANY, OF ALLIANCE, OHIO, A CORPORATION OF OHIO.

PHASE DISTRIBUTION FOR ELECTRIC FURNACES.

Application filed January 31, 1918.

To all whom it may concern:

.llc it known that we, Tainan-Jr's F. BAILY and Fns xx T. Corn, citizens of the United States, both residing at Alliance, in the county of Stark and State of Ohio, have invented a new and useful Phase Distribution for Electric Furnaces, of which the following is a specification.

This invention relates to phase distribution and has more especial reference to a phase distribution for electric furnaces used in heat treating of metal where two furnaces of different temperatures are used, one a high t-mperaturc and the other a low temperature furnace, the construction being designed for the purpose of balancing the three phases equally.

The object of the present invention is the provision of a construction in which a three phase supply is distributed to two electric furnaces, one furnace being approximately twice the temperature of the other furnace, two phases being led into the high temperature furnace and the remaining phase being led into the low temperature furnace.

With this object in view the invention consists in the novel construction and arrangement of parts, hereinafter described,

illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size and minor details of construction may be made within the scope of the appended claims, without departing from the spirit or sacrificing any of the advantages of the invention.

The drawings show a diagrammatic plan view. of the two heat treating furnaces, showing the phase distribution to the furnace.

Similar numerals of reference indicate corresponding parts throughout the drawmg.

Of a three phase supply, two phases are led into one furnace, the hotter one, and the remaining phase supplies current to the other furnace. In heat treating operations which consists of two furnaces one approximatelv half as hot as the other this is very adaptable. There is also eliminated any danger of unhalancing the line. 7

' The numerals 1, 2 and 3 indicate respectively the three phase wires of supply and the numerals 1 and 5 the high and low Specification of Letters Patent.

. temperature furnace,

Patented Mar. 26, 1918.

Serial No. 214,585.

temperature furnaces respectively, the fur.-

nace 4 being arranged to be kept at a temperature approximately twice the temperature of the furnace 5. The furnace 4 is provided with the usual resistance elements 6 and 7, the element 6 being provided with the terminals 9 and 10 and the element 7 with the terminals 11 and 12, said terminals being connected in the circuit and arran ed to create a relatively hi h temperature wlthin the troughs by comp eting thecircuit between each pair of terminals through the resistance elements. The terminal 9 in the trough 6 is connected with the supply wire 1 by means of a wire 13 and the electrode 10 in said trough and the electrode 12 in the trough 7 receive the entire su ply from the wire 3 while the electrode 11 m the element 7 is connected to the supply wire 2 by means of a wire 14,

The furnace 5 is provided with the elements 15 and 16, the element 15 being provided with the terminals 17 and 18 and the element 16 with the terminals 19 and 20. The terminals 17 and 19 in the elements 15 and 16 respectively being connected by means of a wire 21 with the wire 1 while the terminals 18 and 20 in the elements 15 and 16 respectively are connected by means of a wire 22 with the wire 2.

It will be seen by this construction that two phases are led into the high temperature furnace 4 while the remaining phase is led into the low temperature furnace 5, thus maintaining the two furnaces in the proper relative temperature and eliminating any danger of unbalacing the line.

It will of course be readily apparent that the construction above described may be adaptable to different forms of furnaces than the specific type illustrated in the drawings. The specific construction shown being merely for the purpose of illustration.

We claim I. In combination with a three phase supply. a. high temperature furnace and a low two phases supplying current to the high temperature furnace and the remaining phase supplying current to the low temperature furnace. 4

2. In combination with a three phase supply, a heating furnace'and a reheating furnace. two phases supplying current to' the heating furnace and the remaining phase 3 3. The combination with a three phase supply 01' a high temperature furnace and a low temperature furnace, a pair of resistance elements located in each of said furnaces, one phase supplying current to both resister elements in the lttlltltillg l'urnaee, the remaining two phases supplying the current; to the resistance elements in the heating furnace.

4. In combination with a three phase snpply, a heating furnace and a reheating furnace, a pair of resister elements in each 1'ur nace, one of the supply wires from said three phase supply leading to each Of the resistance elements in the heating furnace, (he serond supply wire from said three phase suppl eonnerted with one of the reslstanee elements in said heating furnace ai d with both of the resi tant-e elements in the reheating furnace and the third supply wire connected with the other of the resistant-e elements in said heating furnace and with both of the resistance elements in the reheating furnace.

In testimony that we claim the above, we

have hereunto subscribed our names.

TI-IADDEUS l BAILY. FRANK T. COPE. 

